Impression adjusting mechanism



Sept. 22, 1931. F. LAMATSCH IMPRESSION ADJUSTING MECHANISM Filed NOV.16, 1928 2 Sheets-Sheet l INVE NTOR A'rrY.

Sept. 22, 1931.

F. LAMATscH v 1,824,436

IMPRESSION ADJUSTING MECHANISM Filed NOV. 16, 1928 2 Sheets-Sheet 2INVEN'roR MQW/5&4

Patented Sept. 22, 1,931

UNITED STATES PATENT OFFICE FREDERICK LAMATSCH, 0F GRANTWOOD, NEWJERSEY, ASSIGNOR TO R. HOE & CO., INC., OF NEW YORK, N. Y., ACORPORATION OF NEW YORK IMPRESSION ADJUSTING- MECHANISM Application ledNovember 16, 1928. Serial No. 319,835.

T his invention pertains to machines used in the printing artandespecially to printing machines in which an impression is madebetween a cylinder and a co-acting impression surface which may be ofcylindrical form.

As is well understood by those versed in the art, it is necessary toprovide means to adjust the pressure with which the impression is madeand it is customary to arrange the bearings of the cylinder so theymaybe shifted to increase or diminish the pressure. This adjustment asheretofore performed has been a diiiicult operation requiring the use ofthickness gauges and extreme care on the part of the operator to obtainthe setting of the bearings at both sides of the machine that willinsure thecorrect pressure on the sheet to be printed as it passesbetween the cylinders. f

The difficulty mentioned above has been overcome by the inventiondisclosed herein,

` the especial object of which is to provide a mechanism to accuratelyand expeditiously adjust and secure the cylinder of a printing machinewith respect to its co-acting impression member, and by easily readablemeans, indicate the magnitude of the adjustment and the position of eachend of the cylinder with respect to the other end, and to the impressionmember.

It is also an object of the invention to provide an impression adjustingmechanism of generally improved construction. whereby the device will besimple, durable and inexpensive in construction, as well as convenient,practical, serviceable and efficient in its use.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts, and in the details of construction hereinafterdescribed and claimed, itsbeing understood that various changes in theprecise embodiment of the invention herein disclosed may be. made withinthe scope of what is claimed without departing from the spirit of theinvention.

In the accompanyingdrawings:

Figure 1 shows the invention applied to the form cylinder of a rotaryprinting ma-v Figure 4 is a fragmentary View partly in sectionshowingthe .adjusting mechanism as viewed in the direction of arrow l ofFigure 1; and

F ignre 5 shows the indicating device as l viewed in the direction ofarrow 5 of Figure l.

In the embodiment of the invention shown in the drawings, 11 indicates aside frame of a printing machine, having a printing couple consisting ofa cylinder 12, carrying a printing plate or form, and'co-actingimpression cylinder 13, a portion ofwhich is shown.

Means are'provided for movingtlie printing cylinder 12 toward or awayfrom the impression cylinder 13 by the eccentric bushing 14; fitted tohave a limited arc of rotation in the frame 11. The bore ofthe bushingmay, as shown in the drawings, be fitted to receive the outer member 15of a roller bearing, having rollers 16, supported in a cage 17, and aninner member 18,/to which the journal 19 of the cylinder 12 is fitted.

The bushing 14 ,is formed with a flange 20 which is engaged by theclamps'21 and 22,' secured to the frame 11. The bushing is thus held toits seat in the frame.

` End thrust of the cylinder in either direction is absorbed by a deepgroove ball bearing consisting of an outer member 23, balls, one ofwhich is shown at 241, and an inner member 25. The inner member issecured to the 'cylinder journal and the outer member is secuied to thebushing 1&1, being clamped thereto by the ring 26, held by the bolts 27.

A segmental gear 28, is formed on the ring 26, and a co-acting worm 29is carried by the shaft 30, which is supported in bearing brackets 31and 32, both of which are secured to the frame 11. The bracket 32 isslotted and provided with a clamping screw 33, having a wrench 34bymeans of which the shaft 30 may be clamped in any desired position.

The shaft 30 has a squared end 35, adapted to receive a wrench and isprovided with a pointer 36 which is rotated over the face of an indexdial 37 secured to the bracket 31.

It will be seen that by turning the shaft 30 the bushing 14 will berotated in the frame 11, and as the bore of the bushing is eccentricallylocated with respect to the outsidel circumference which is fitted tothe frame, the cylinder 12 will be moved toward or away from itsco-acting impression member 13.

Although but one end of the cylinder and one adjusting mechanism areshown, it will be understood that the mechanism shown and described isduplicated on the opposite side of the machine and that either or bothof the bearings of the cylinder may be adjusted as desired.

The dial 37 may be graduated as shown on the drawing and the pointerarranged to indicate 0 when the impression pressure is normal. Then if agreater pressure is desired the shaft 30 is turned clockwise, or for alesser pressure it is turned counter-clockwise. With the pointer in theposition shown in Figure 5, it would indicate that the impressionpressure had lbeen increased by moving the cylinder bearing in, .0015inch.

The combination of the worm gearing with the eccentric bushing greatlymultiplies the movement of the shaft 30 with respect to the movement ofthe cylinder bearing, and inconsequence the movement of the pointer 36with respect to the dial 37 produces a highly amplified indication ofthe movement of the` bearing.

As the range of adjustment required does not exceed a complete turn ofthe shaft 30, it will be seen that the position of the pointer y is anaccurate indication of the position of the cylinder bearings and anydesired movement of either end of the cylinder to increase or diminishthe impression pressure can be accurately made.

What I claim is:

1. In a printing machine having a frame a printing couple consisting ofa form cylin der and an impression cylinder. journals for the cylinders.bearings for the journals, said bearings for the journals of onecylinder comprising eccentric bushings rotatable in the frame, gearssecured to the bushings, worms cro-acting with the gears, suitablylsupported shafts secured to the worms, means for securing the shafts toprevent their rotation, pointers on the shafts, and index plates on theframe whereby the positions of the bearings vfor the journals of one ofthe cylinders are indicated.

2. In a printing machine having a frame,

a printing couple consisitng of a form cylinder and an impressioncylinder, journals for the cylinders, bearings for the journals, saidbearings 'for the journals of one cylinder comprising eccentric bushingsrotatable in the frame, gears secured to the bushings, worms co-actingwith the gears, shafts secured to the worms, supports for the shaftsarranged to allow the shafts to rotate and having means to lock theshafts against rotaiion, and devices whereby the positions of thebearings for the journals of one of the cylinders are indicated so theymay be easily observed.

3. In a mechanism for adjusting a bearingl for a printing cylinder andindicating the position of said cylinder with relation to a cooperatingcylinder, a-Ashaft rotatable in 'bearings secured to a support, meansfor clamping the shaft in an adjusted position, a worm on the shaft, aneccentric bushing for the cylinder bearing Yfitted to rotate in thesupport and having teeth adapted to engage the worm, and a pointer and acooperating dial one of which is secured to the shaft and the otherof'which is supported in a relatively fixed position.

4. In a mechanism for adjusting a bearing -for a printing cylinder andindicating the position of said cylinder with relation to a cooperatingcylinder, a. shaft rotatable in bearings secured to a support, means forclamping the shaft to prevent its rotation, a worm secured to the shaft,an eccentric bushing for the cylinder bearing fitted to rotate in thesupport and having teeth adapted to engage the worm, a pointer securedto the shaft and an index dial fixed relative to the support and adaptedto cooperate with the pointer.

5. In an adjusting mechanism for a cylinder having a journal, a bushingfitted to rotate in a bore in a frame and having a journal bearingeccentrically arranged with respect to the bore, a segmental worm gearon the bushing, a shaft having a worm meshing with the worm gear,bearings secured to the frame for rotatably supporting the shaft, meansfor clamping the shaft to prevent movement of the bushing, and an indexand a cooperating dial, one of which is secured to the shaft and theother of which is securedto the frame.

In testimony whereof. I aiiiX my signature.

FREDERICK LAMATSCH.

